Tait equation in the extended corresponding states framework: Application to liquids and liquid mixtures

Abstract

In this work, we propose a simple but efficient scheme based on a reformulation of the Tait equation in the extended corresponding states framework. Starting from the properties at one reference point and knowing the critical temperature and pressure and the acentric factor, this equation allows for an accurate prediction of density and isothermal compressibility of weakly polar pure liquids. This scheme has been applied to 30 different compounds, from noble gases to n-nonadecane, over a wide range of conditions going up to 0.99 times the critical temperature and for pressures up to 150MPa. It has been found that the average absolute deviations resulting from the proposed scheme are of the order of 0.1% for density and around 2% for isothermal compressibility with a slight deterioration when dealing with species possessing a low critical temperature. In addition, for three different simple liquid mixtures, it is shown that the predictions of this scheme (using simply Kay’s mixing rules are as good as those for pure fluids.